Compressor, refrigeration cycle device, and method for manufacturing compressor

Abstract

This compressor comprises: a compression mechanism for compressing a refrigerant; an electric motor for driving the compression mechanism; a rotary shaft connecting the compression mechanism and the electric motor, and transmitting the rotational force of the electric motor to the compression mechanism; a sealed container that accommodates the compression mechanism, the electric motor, and the rotary shaft, and that has in a lower portion thereof an oil reservoir section in which refrigerator oil is stored; and a bottom-raising structure for raising the bottom of the oil reservoir section. The sealed container has a bottomed cylindrical bottom section forming the bottom surface of the oil reservoir section and positioned under the rotary shaft. The bottom-raising structure has: a plate-shaped partition member that partitions the interior of the bottom section into two spaces in the axial direction of the rotary shaft, and raises the bottom of the oil reservoir section; and a positioning member that is provided protruding from the inner circumferential surface of the bottom section, and that positions the partition member. The partition member is secured to the bottom section in a state of being positioned by the positioning member.

Description

[Technical Field]

[0001] The present disclosure relates to a compressor including an oil reservoir for storing refrigeration oil, a refrigeration cycle device, and a method for manufacturing a compressor. [Background technology]

[0002] Refrigeration oil is sealed inside the compressor to lubricate the sliding parts of the compression mechanism. The refrigeration oil is stored in an oil sump located at the bottom of the compressor's sealed container. The compressor has a rotating shaft that drives the compression mechanism. An oil pump located at the lower end of the rotating shaft draws refrigeration oil from the oil sump and supplies it to the compression mechanism through an oil supply hole located inside the rotating shaft. Because the compressor uses the oil pump to draw refrigeration oil from the oil sump, the oil level in the oil sump must be at least a certain height above the oil supply port so that the oil supply port at the lower end of the oil pump is submerged in the refrigeration oil. Therefore, the amount of refrigeration oil to be sealed in the sealed container is determined based on the oil level and the volume of the lower section of the sealed container that forms the oil sump.

[0003] It is desirable to reduce the amount of refrigerating machine oil filled as much as possible in terms of reducing the weight and cost of the compressor, etc. Therefore, it is required to reduce the amount of refrigerating machine oil filled while maintaining an oil level position that enables the supply of refrigerating machine oil to the compression mechanism.

[0004] The compressor described in Patent Document 1 is known as a compressor that reduces the amount of oil while maintaining the oil level. The compressor in Patent Document 1 has a bottom-raising structure that raises the bottom of the oil reservoir. The bottom-raising structure has a plate-shaped partition member that is disposed below the rotating shaft and fixed to the inner peripheral surface of the sealed container. The bottom-raising structure raises the bottom of the oil reservoir with the partition member, preventing refrigeration oil from flowing below the partition member, thereby reducing the amount of refrigeration oil enclosed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-170202 Summary of the Invention [Problem to be solved by the invention]

[0006] In the compressor of Patent Document 1, the inner peripheral surface of the sealed container to which the partition member is fixed is a simple cylindrical surface without any protrusions, etc. Therefore, when fixing the partition member to the inner peripheral surface of the sealed container, it is necessary to hold the partition member in place at the fixed position on the inner peripheral surface with a jig or the like, and then fix the partition member by, for example, full-circumference welding, which makes the fixing work difficult. In other words, it is difficult to configure a bottom-raised structure for the compressor of Patent Document 1.

[0007] The present disclosure is intended to solve the above-mentioned problems, and aims to provide a compressor, a refrigeration cycle device, and a method for manufacturing a compressor that can easily construct a bottom-raising structure that raises the bottom of the oil reservoir. [Means for solving the problem]

[0008] The compressor according to the present disclosure includes a compression mechanism that compresses a refrigerant, an electric motor that drives the compression mechanism, a rotating shaft that connects the compression mechanism and the electric motor and transmits the rotational force of the electric motor to the compression mechanism, a sealed container that houses the compression mechanism, the electric motor, and the rotating shaft and has an oil reservoir in a lower portion in which refrigeration oil is stored, and a bottom-raising structure that raises the bottom of the oil reservoir, the sealed container being located below the rotating shaft and having a bottomed cylindrical bottom that forms the bottom surface of the oil reservoir, the bottom-raising structure having a plate-like partition member that divides the interior of the bottom into two spaces in the axial direction of the rotating shaft and raises the bottom of the oil reservoir, and a positioning portion that protrudes from the inner peripheral surface of the bottom and positions the partition member, the partition member being fixed to the bottom while being positioned by the positioning portion. The space surrounded by the partition member and the bottom is airtightly separated from the space in the sealed container in which the compression mechanism and the electric motor are disposed. This is what is being done.

[0009] A refrigeration cycle device according to the present disclosure includes the above-described compressor, a condenser, a pressure reducer, and an evaporator.

[0010] A method for manufacturing a compressor according to the present disclosure is a method for manufacturing a compressor including: a compression mechanism that compresses a refrigerant; an electric motor that drives the compression mechanism; a rotating shaft that connects the compression mechanism and the electric motor and transmits the rotational force of the electric motor to the compression mechanism; and a sealed container that houses the compression mechanism, the electric motor, and the rotating shaft and has an oil reservoir in a lower portion in which refrigeration oil is stored, the sealed container being located below the rotating shaft and having a cylindrical bottom with a bottom that forms the bottom surface of the oil reservoir, and a plate-like partition member that divides the interior of the bottom into two spaces in the axial direction of the rotating shaft is positioned in a positioning portion that protrudes from the inner circumferential surface of the bottom and the partition member is fixed to the bottom. By doing so, the space surrounded by the partition member and the bottom is airtightly separated from the space in the sealed container in which the compression mechanism and the electric motor are disposed. It is something. [Effects of the Invention]

[0011] According to the present disclosure, a positioning portion for positioning a partition member of a bottom-raised structure is formed protruding from the inner peripheral surface of the bottom of the sealed container, and the partition member is fixed to the bottom of the sealed container while being positioned by the positioning portion. In this way, since the partition member is positioned by the positioning portion, the bottom-raised structure can be easily configured. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic cross-sectional view of a compressor according to a first embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along line AA in FIG. [Figure 3] 3 is a schematic vertical cross-sectional view of the bottom of the lower container in the compressor according to the first embodiment. FIG. [Figure 4] 4 is a schematic explanatory view of striped fibers in a cross section of the bottom of the lower container in the compressor according to the first embodiment. FIG. [Figure 5] 5A to 5C are process diagrams of a method for manufacturing the bottom-raised structure of the compressor according to the first embodiment. [Figure 6] 5A to 5C are explanatory diagrams of a manufacturing method for the bottom-raised structure of the compressor according to the first embodiment. [Figure 7] 5 is another process diagram of the method for manufacturing the bottom-raised structure of the compressor according to the first embodiment. FIG. [Figure 8]FIG. 10 is a schematic plan view of the bottom of a lower container of a compressor according to a second embodiment. [Figure 9] FIG. 10 is a schematic vertical cross-sectional view of the bottom of a lower container of a compressor according to a second embodiment. [Figure 10] FIG. 10 is a refrigerant circuit diagram showing a schematic configuration of a refrigeration cycle device according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments will be described with reference to the drawings. Note that the present disclosure is not limited to the embodiments described below. In addition, in the following drawings including FIG. 1, the relative dimensional relationships and shapes of each component may differ from the actual ones. In addition, in the following drawings, items with the same reference numerals are the same or equivalent, and this applies throughout the entire specification.

[0014] Embodiment 1 [Compressor 100] FIG. 1 is a schematic cross-sectional view of a compressor 100 according to a first embodiment. FIG. 2 is a schematic cross-sectional view taken along line AA in FIG. 1. The overall configuration of the compressor 100 will be described with reference to FIGS. 1 and 2. The compressor 100 may be, for example, a one-cylinder rotary compressor having one cylinder, as shown in FIG. 1, i.e., a single rotary compressor. Note that the compressor 100 is not limited to a single rotary compressor, and may be a rotary compressor having multiple cylinders. The compressor 100 may be, for example, a twin rotary compressor having two cylinders, or another compressor configured differently.

[0015] The compressor 100 accommodates, within a sealed container 10, a compression mechanism 20 that compresses a refrigerant, an electric motor 30 that drives the compression mechanism 20, and a rotating shaft 21 that connects the compression mechanism 20 and the electric motor 30 and transmits the rotational force of the electric motor 30 to the compression mechanism 20. Within the sealed container 10, the compression mechanism 20 is disposed below the sealed container 10, and the electric motor 30 is disposed above the sealed container 10. In the following description, the direction in which the rotating shaft 21 extends is referred to as the axial direction, the direction perpendicular to the axial direction is referred to as the radial direction, and the direction around the rotating shaft is referred to as the circumferential direction.

[0016] The electric motor 30 includes a rotor 31 made of a magnetic material and a stator 32 that applies a rotating magnetic field to the rotor 31 to rotate the rotor 31. The electric motor 30 and the compression mechanism 20 are connected by a rotating shaft 21. The rotating shaft 21 transmits the rotational motion of the electric motor 30 to the compression mechanism 20. The compression mechanism 20 compresses the refrigerant by the transmitted rotational force and discharges the compressed refrigerant into the sealed container 10.

[0017] The sealed container 10 has an upper container 11 and a lower container 12. The upper container 11 has a configuration in which a top plate portion 11a and a cylindrical portion 11b are integrally formed. The lower container 12 has a configuration in which a bottomed tubular bottom portion 12a and a cylindrical portion 12b are joined by welding. The bottom portion 12a is located below the rotation shaft 21, and the cylindrical portion 12b is located above the bottom portion 12a. The lower container 12 is formed by joining the upper end of the bottom portion 12a and the lower end of the cylindrical portion 12b by welding. The sealed container 10 is formed by joining the lower end of the cylindrical portion 11b of the upper container 11 and the upper end of the cylindrical portion 12b of the lower container 12 by welding. The sealed container 10 is fixed to fixing legs 13 provided at its lower portion.

[0018] The sealed container 10 is filled with a high-temperature, high-pressure refrigerant compressed by the compression mechanism 20. The sealed container 10 has the strength to withstand the pressure generated inside the sealed container 10 while the compressor is operating. The sealed container 10 is made of carbon steel. The material of the sealed container 10 is not limited to carbon steel, and stainless steel may also be used.

[0019] The sealed container 10 has an oil reservoir 10a in the lower part of the sealed container 10 that stores refrigeration oil 300. The refrigeration oil 300 is used to lubricate the compression mechanism 20 and the like. The oil reservoir 10a is raised by a bottom-raising structure 50 having a partition member 51 (described later) that is provided on the bottom 12a of the lower container 12. The bottom-raising structure 50 will be described later.

[0020] A suction connecting pipe 101a communicating with a suction muffler 101 is connected to the sealed container 10, and the refrigerant is taken into the sealed container 10 from the suction muffler 101 through the suction connecting pipe 101a. A discharge pipe 61 is connected to the top of the sealed container 10, and the compressed refrigerant is discharged from the discharge pipe 61.

[0021] An oil pump (not shown) is provided below the rotating shaft 21. The oil pump has an oil inlet 28 at its lower end. Refrigeration oil 300 stored in the oil reservoir 10a is drawn up through the oil inlet 28 and supplied to each sliding part of the compression mechanism 20 via an oil supply hole (not shown) provided at the axial center of the rotating shaft 21. The oil inlet 28 is immersed in the refrigeration oil 300 stored in the oil reservoir 10a. Supplying oil to the sliding parts using the oil pump ensures mechanical lubrication of the compression mechanism 20. Note that, in the case where the oil pump is composed of, for example, an oil supply hole in the rotating shaft 21 and pump vanes disposed within the oil supply hole, the oil inlet 28 corresponds to the lower end opening of the oil supply hole in the rotating shaft 21. The oil inlet 28 is not limited to the lower end opening of the oil supply hole in the rotating shaft 21, and may be any opening appropriate for the shape of the oil pump.

[0022] The rotating shaft 21 has a main shaft portion 21a, an eccentric shaft portion 21b, and a counter shaft portion 21c, which are formed in this order from top to bottom in the axial direction. The main shaft portion 21a is fixed to the rotor 31 of the electric motor 30 by shrink fitting or press fitting. The eccentric shaft portion 21b is slidably fitted into a rolling piston 22, which will be described later.

[0023] The compression mechanism 20 includes a cylinder 23, a rolling piston 22, an upper bearing 24, a lower bearing 25, and a vane 26. The cylinder 23 is configured in an annular shape, and a through-hole is formed in the center so as to penetrate in the up-down direction. Openings at both ends of the through-hole in the axial direction are closed by the upper bearing 24 and the lower bearing 25, and a cylindrical space, i.e., a cylinder chamber 23a, is formed inside the cylinder 23. The eccentric shaft portion 21b of the rotary shaft 21, the rolling piston 22, and the vane 26 are housed inside the cylinder chamber 23a.

[0024] As shown in FIG. 2, a suction port 23d, through which suction refrigerant from the suction connecting pipe 101a passes, is provided radially penetrating the cylinder 23. A vane groove 23c extending radially is also formed axially penetrating the cylinder 23. One radial end of the vane groove 23c opens into the cylinder chamber 23a, and the other radial end opens into a back pressure chamber 23b (described later). A vane 26 is housed in the vane groove 23c. The vane 26 reciprocates radially within the vane groove 23c. The vane 26 has a substantially rectangular parallelepiped shape, with the circumferential thickness of the vane 26 being smaller than its radial and axial lengths.

[0025] A back pressure chamber 23b is formed at the radially outer end of the vane groove 23c, which introduces discharge pressure to the rear end 26a of the vane 26. The back pressure chamber 23b is in communication with the internal space of the sealed container 10, and the refrigerant gas flowing in from the sealed container 10 creates a high discharge pressure equivalent to that inside the sealed container 10. A vane spring 29 is disposed in the back pressure chamber 23b. The vane spring 29 biases the tip end 26b of the vane 26 so that it abuts against the outer peripheral surface of the rolling piston 22. The vane spring 29 is formed, for example, by a coil spring.

[0026] A radially inward force acts on the rear end 26a of the vane 26 due to the discharge pressure in the back pressure chamber 23b. Furthermore, a radially outward force acts on the vane 26 due to the pressure of the refrigerant gas in the cylinder chamber 23a. Therefore, during operation of the compressor 100, the vane 26 is pressed radially inward by a force resulting from the pressure difference between the discharge pressure of the back pressure chamber 23b and the pressure of the refrigerant gas in the cylinder chamber 23a. Furthermore, the vane 26 is pressed radially inward by the spring force of the vane spring 29. Therefore, the vane 26 is pressed radially inward by the force resulting from the pressure difference between the discharge pressure of the back pressure chamber 23b and the pressure of the refrigerant gas in the cylinder chamber 23a, and the spring force of the vane spring 29.

[0027] When the vane 26 is pressed radially inward, the tip portion 26b comes into contact with the outer peripheral surface of the rolling piston 22, dividing the cylinder chamber 23a into a suction chamber and a compression chamber. As the rolling piston 22 eccentrically rotates within the cylinder chamber 23a, the vane 26 reciprocates within the vane groove 23c while the tip portion 26b remains in contact with the outer peripheral surface of the rolling piston 22.

[0028] At the start of the compressor 100, for example, the pressure difference between the pressure of the refrigerant gas in the back pressure chamber 23b and the pressure of the refrigerant gas in the cylinder chamber 23a may not be sufficient to bring the tip end 26b of the vane 26 into contact with the outer circumferential surface of the rolling piston 22. The compressor 100 is provided with a vane spring 29, and the spring force of the vane spring 29 can press the vane 26 radially inward. Therefore, the compressor 100 can bring the tip end 26b of the vane 26 into contact with the outer circumferential surface of the rolling piston 22 at all times.

[0029] The rolling piston 22 is formed in a ring shape, and the inner peripheral surface of the rolling piston 22 is slidably fitted onto the outer peripheral surface of the eccentric shaft portion 21b of the rotary shaft 21. As the rotary shaft 21 rotates, the rolling piston 22 rotates eccentrically within the cylinder chamber 23a.

[0030] The upper bearing 24 is fitted onto the main shaft portion 21a of the rotary shaft 21 and rotatably supports the main shaft portion 21a. The upper bearing 24 is formed in a substantially inverted T shape in side view. The upper bearing 24 closes the upper axial opening of the cylinder chamber 23a. The upper bearing 24 is provided with a discharge port (not shown) that discharges compressed refrigerant gas out of the cylinder chamber 23a.

[0031] A discharge valve (not shown) is provided in the discharge port of the upper bearing 24. The discharge valve controls the discharge timing of the high-temperature, high-pressure refrigerant gas discharged from the cylinder chamber 23a through the discharge port. That is, the discharge valve closes the discharge port until the refrigerant compressed in the cylinder chamber 23a of the cylinder 23 reaches a set pressure, and when the pressure reaches or exceeds the set pressure, opens the discharge port to discharge the high-temperature, high-pressure refrigerant out of the cylinder chamber 23a.

[0032] The lower bearing 25 is fitted onto the countershaft portion 21c of the rotary shaft 21 and rotatably supports the countershaft portion 21c. The lower bearing 25 is formed in a substantially T-shape in a side view. The lower bearing 25 closes the axially lower opening of the cylinder chamber 23a.

[0033] Because the operations of suction, compression, and discharge of refrigerant gas are repeated in cylinder chamber 23a, the compressed refrigerant is intermittently discharged from a discharge port provided in upper bearing 24, generating noise such as pulsating sounds. To reduce such noise, a discharge muffler 27 is attached to the outside of upper bearing 24, i.e., on the motor 30 side, so as to cover upper bearing 24. Discharge muffler 27 is provided with a discharge hole (not shown) that communicates between the space formed by discharge muffler 27 and upper bearing 24 and the inside of sealed container 10. Refrigerant discharged from cylinder chamber 23a through the discharge port provided in upper bearing 24 is first discharged into the space formed by discharge muffler 27 and upper bearing 24, and then discharged from the discharge hole provided in discharge muffler 27 into sealed container 10.

[0034] A suction muffler 101 is provided next to the sealed container 10. The suction muffler 101 is connected to the suction port 23d of the cylinder 23 by a suction connecting pipe 101a. The suction muffler 101 separates liquid refrigerant from gas refrigerant and sends only the gas refrigerant to the cylinder chamber 23a. A mixture of low-pressure gas refrigerant and liquid refrigerant is sent to the compressor 100 from an external circuit to which the compressor 100 is connected. If the liquid refrigerant flows into the cylinder chamber 23a and is compressed by the compression mechanism 20, the compression mechanism 20 will malfunction. For this reason, the suction muffler 101 is provided upstream of the compressor 100 to prevent the liquid refrigerant from being directly sucked into the cylinder chamber 23a of the cylinder 23.

[0035] In the compressor 100 configured as described above, when the electric motor 30 is energized, the rotary shaft 21 rotates, and the rolling piston 22 rotates eccentrically in the cylinder chamber 23a together with the eccentric shaft portion 21b of the rotary shaft 21. Refrigerant drawn into the sealed container 10 from the suction muffler 101 through the suction connecting pipe 101a flows into the suction chamber in the cylinder chamber 23a, and is compressed in the compression chamber as the rolling piston 22 rotates eccentrically in the cylinder chamber 23a. The compressed refrigerant is first discharged into the discharge muffler 27 through a discharge valve (not shown) provided in the upper bearing 24.

[0036] The refrigerant discharged into the discharge muffler 27 is discharged from a discharge port (not shown) of the discharge muffler 27 into the internal space of the sealed container 10. The refrigerant discharged into the internal space of the sealed container 10 passes through refrigerant flow path holes formed in the electric motor 30 and flows into the space above the electric motor 30. The refrigerant gas that flows into the space above the electric motor 30 is discharged from the discharge pipe 61 to the outside of the sealed container 10. A refrigerant circuit through which the refrigerant flows is configured outside the sealed container 10, and the refrigerant discharged from the discharge pipe 61 circulates through the refrigerant circuit and returns to the suction muffler 101.

[0037] Here, the refrigerant used may be R290 refrigerant, R32 refrigerant, R410A refrigerant, or the like.

[0038] Next, the bottom-raising structure 50 will be described in detail with reference to FIG. 1 and the following FIGS. 3 and 4. FIG.

[0039] Fig. 3 is a schematic vertical cross-sectional view of the bottom 12a of the lower container 12 in the compressor 100 according to embodiment 1. Fig. 4 is a schematic explanatory view of striped fibers in a cross section of the bottom 12a of the lower container 12 in the compressor 100 according to embodiment 1.

[0040] The bottom-raising structure 50 is provided on the bottom 12a of the lower container 12 (hereinafter referred to as the bottom 12a of the sealed container 10). The bottom 12a of the sealed container 10 is a portion that forms the bottom surface of the oil reservoir 10a. The bottom 12a of the sealed container 10 has a disk-shaped bottom center 12a1, a truncated cone portion 12a2 in the shape of an inverted truncated cone that is integrally formed around the entire circumference of the bottom center 12a1, and a bottom cylindrical portion 12a3 that is integrally formed around the entire circumference of the truncated cone portion 12a2 and extends in the axial direction. The bottom 12a of the sealed container 10 is formed in a bowl shape so that the bottom 12a can be welded to the fixed legs 13.

[0041] The bottom-raising structure 50 has a partition member 51 and a positioning portion 52. The partition member 51 is a plate-shaped member that divides the inside of the bottom 12a of the sealed container 10 into two spaces in the axial direction of the rotating shaft 21 and raises the bottom of the oil reservoir 10a. The partition member 51 is a disk-shaped sheet metal part, and is formed from carbon steel. Stainless steel may also be used as the material for the partition member 51. The partition member 51 has the strength to withstand the pressure generated inside the sealed container 10 while the compressor 100 is in operation.

[0042] The positioning portion 52 is a portion that positions the partition member 51 and is provided so as to protrude from the inner peripheral surface 12aa of the bottom portion 12a. The positioning portion 52 is composed of a step portion 52a that protrudes from the inner peripheral surface 12aa of the bottom portion 12a. The step portion 52a is formed in a stepped shape when viewed in a cross section including the axis O of the sealed container 10. The step portion 52a is formed in an annular shape on the inner peripheral surface 12aa of the bottom portion 12a, centered on the axis O of the sealed container 10. Specifically, as shown in FIG. 4, the step portion 52a is a surface on which the partition member 51 is placed, and has an annular placement surface 52aa that extends in the radial and circumferential directions, and a cylindrical surface 52ab that extends in the axial direction from the entire outer periphery of the placement surface 52aa. The diameter of the cylindrical surface 52ab is configured to be larger than the diameter of the partition member 51. Although FIG. 3 shows an example in which the step portion 52a is provided on the truncated cone portion 12a2, it may also be provided on the bottom cylindrical portion 12a3.

[0043] The positioning portion 52 positions the partition member 51 by placing the partition member 51 on the placement surface 52aa of the step portion 52a. Positioning by the positioning portion 52 is not limited to positioning using the placement surface 52aa, and positioning using the cylindrical surface 52ab may also be performed. When positioning using the cylindrical surface 52ab, the diameter of the cylindrical surface 52ab is formed to be approximately the same as the diameter of the partition member 51, and the partition member 51 is positioned by fitting it into the cylindrical surface 52ab.

[0044] The bottom 12a of the sealed container 10, including the step 52a, is entirely formed by press working. Because the bottom 12a of the sealed container 10 is formed by press working, the striped fibers Z that make up the step 52a are present in a meandering state without being broken. The step 52a may also be formed by cutting work. However, if the step 52a is formed by cutting work, the striped fibers Z will be broken. Therefore, by forming the bottom 12a of the sealed container 10, including the step 52a, by press working, it is possible to make it highly durable.

[0045] 3, the partition member 51 is fixed to the bottom 12a by the brazing material 53 in a state in which the partition member 51 is placed on a mounting surface 52aa of a step portion 52a that constitutes the positioning portion 52. The brazing material 53 is provided around the entire periphery of the partition member 51, and the entire periphery of the partition member 51 is fixed to the step portion 52a. As a result, the space K surrounded by the partition member 51 and the bottom 12a is airtightly separated from the space in the sealed container 10 in which the compression mechanism 20 and the electric motor 30 are disposed.

[0046] With the above configuration, the refrigeration oil 300 sealed in the sealed container 10 does not enter the space K below the partition member 51, and the bottom surface of the oil reservoir 10a of the compressor 100 can be raised by the partition member 51.

[0047] Incidentally, in the compressor 100, it is necessary to seal refrigerating machine oil 300 in the sealed container 10 before shipping. The amount of refrigerating machine oil 300 to be sealed is set so that the oil level is located above the oil inlet 28 of the oil pump by a predetermined height. If the bottom-raising structure 50 were not provided, the refrigerating machine oil 300 would accumulate in the space K, and therefore the amount of refrigerating machine oil 300 to be sealed would increase when the refrigerating machine oil 300 is sealed up to the required oil level.

[0048] In contrast, the compressor 100 of the first embodiment is provided with the bottom-raising structure 50, which raises the bottom of the oil reservoir 10a. Therefore, the compressor 100 of the first embodiment can reduce the amount of oil required to seal the refrigeration oil 300 up to the required oil level height.

[0049] In the bottom-raised structure 50 of the first embodiment, the partition member 51 is fixed to the sealed container 10 by the brazing material 53 while being positioned by the positioning portion 52. Therefore, when fixing the partition member 51 to the sealed container 10, the partition member 51 can be positioned without using a jig as in the conventional case. Therefore, the bottom-raised structure 50 can be easily configured in the compressor 100 of the first embodiment.

[0050] [Method for manufacturing compressor 100] Next, a method of manufacturing the compressor 100, specifically, a method of manufacturing the bottom-raised structure 50, will be described with reference to FIGS.

[0051] Fig. 5 is a process diagram of a method for manufacturing the raised bottom structure 50 of the compressor 100 according to the first embodiment. Fig. 6 is an explanatory diagram of the method for manufacturing the raised bottom structure 50 of the compressor 100 according to the first embodiment. First, the partition member 51 is placed on the mounting surface 52aa of the step portion 52a provided on the bottom 12a of the sealed container 10 (S1). At this time, the partition member 51 is positioned by the step portion 52a. Next, a ring-shaped brazing material 53 is placed so as to be in contact with the entire periphery of the partition member 51 (S2).

[0052] Then, the bottom 12a with the partition member 51 and the brazing material 53 placed thereon is placed in a furnace, and the brazing material 53 is melted (S3). As a result, the entire periphery of the partition member 51 and the truncated cone portion 12a2 of the bottom 12a are fixed together with the brazing material 53 without any gaps.

[0053] In this way, the partition member 51 and the bottom portion 12a are fixed by brazing, whereby the bottom-raised structure 50 is fabricated.

[0054] In the compressor 100 of the first embodiment, the partition member 51 and the bottom portion 12a are fixed to each other by brazing, but they may also be fixed to each other by welding. A process diagram of a manufacturing method in which the partition member 51 and the bottom portion 12a are fixed to each other by welding is shown in the following Figure 7.

[0055] 7 is a diagram showing another process of the method for manufacturing the raised bottom structure 50 of the compressor 100 according to the first embodiment. As shown in FIG. 7, first, the partition member 51 is placed on the placement surface 52aa of the step 52a provided on the bottom 12a of the sealed container 10 (S11). At this time, the partition member 51 is positioned by the step 52a. Next, the entire periphery of the partition member 51 is welded to the bottom 12a (S12).

[0056] As described above, in the compressor 100 of the first embodiment, the partition member 51 and the bottom portion 12a may be fixed to each other by welding. However, fixing by welding causes thermal deterioration of the metal structure. On the other hand, fixing by brazing can suppress thermal deterioration of the metal structure compared to fixing by welding. Therefore, fixing by brazing can suppress a decrease in the pressure resistance of the bottom portion 12a. For this reason, fixing the partition member 51 to the bottom portion 12a by brazing is preferable.

[0057] As described above, the compressor 100 of the first embodiment includes the compression mechanism 20 that compresses a refrigerant, the electric motor 30 that drives the compression mechanism 20, and the rotating shaft 21 that connects the compression mechanism 20 and the electric motor 30 and transmits the rotational force of the electric motor 30 to the compression mechanism 20. The compressor 100 also includes a sealed container 10 that houses the compression mechanism 20, the electric motor 30, and the rotating shaft 21 and has an oil reservoir 10a in a lower portion in which refrigeration oil 300 is stored, and a bottom-raising structure 50 that raises the bottom of the oil reservoir 10a. The sealed container 10 is located below the rotating shaft 21 and has a cylindrical bottom 12a with a bottom that forms the bottom surface of the oil reservoir 10a. The bottom-raising structure 50 has a plate-shaped partition member 51 that divides the inside of the bottom 12a into two spaces in the axial direction of the rotating shaft 21 to raise the bottom of the oil reservoir 10a, and a positioning portion 52 that protrudes from the inner peripheral surface 12aa of the bottom 12a and positions the partition member 51. The partition member 51 is fixed to the sealed container 10 while being positioned by the positioning portion 52.

[0058] According to the above configuration, the compressor 100 is fixed to the bottom 12a of the sealed container 10 with the partition member 51 of the bottom-raising structure 50 positioned by the positioning portion 52, making it easy to position the partition member 51 relative to the bottom 12a and making it easy to configure the bottom-raising structure 50.

[0059] The positioning portion 52 is a stepped portion 52a formed in a stepped shape when viewed in a cross section including the axis of the sealed container 10, and is formed in an annular shape on the inner peripheral surface 12aa of the bottom portion 12a around the axis. The stepped portion 52a has an annular mounting surface 52aa extending in the radial and circumferential directions of the rotating shaft 21, and a cylindrical surface 52ab extending in the axial direction from the entire outer periphery of the mounting surface 52aa. The partition member 51 is positioned on the stepped portion 52a by abutting against the mounting surface 52aa or the cylindrical surface 52ab of the stepped portion 52a.

[0060] With the above-described configuration, the compressor 100 can use the step portion 52 a as the positioning portion 52 .

[0061] Embodiment 2 Next, a description will be given of embodiment 2. Note that embodiment 2 differs from embodiment 1 in the configuration of positioning section 52.

[0062] FIG. 8 is a schematic plan view of the bottom 12a of the lower casing 12 in the compressor 100 according to the second embodiment. FIG. 9 is a schematic vertical cross-sectional view of the bottom 12a of the lower casing 12 in the compressor 100 according to the second embodiment. In the compressor 100 according to the second embodiment, the positioning portion 52 is configured with a plurality of protrusions 60 protruding from the bottom 12a of the sealed casing 10. Specifically, the positioning portion 52 is configured with a plurality of protrusions 60 protruding in the axial direction from the truncated cone portion 12a2 of the bottom 12a. The plurality of protrusions 60 are provided at intervals in the circumferential direction. FIG. 8 shows an example in which the protrusions 60 are cylindrical, but the shape of the protrusions 60 is not limited to a cylindrical shape and may be, for example, a polygonal shape or an arc-shaped protrusion extending in the circumferential direction when viewed in the axial direction.

[0063] Also, while FIG. 8 shows an example in which there are three protrusions 60, the number of protrusions 60 is not limited as long as the partition member 51 can be positioned. When the protrusions 60 are cylindrical as shown in the figure, it is preferable that the number of protrusions 60 be three or more in order to position the partition member 51. When the protrusions 60 are arc-shaped protrusions extending circumferentially as viewed in the axial direction, two protrusions 60 are enough to position the partition member 51, so two protrusions 60 are sufficient. The protrusions 60 are formed when the bottom 12a is press-formed. The protrusions 60 may also be formed by cutting the bottom 12a.

[0064] The protrusions 60 abut against the outer peripheral surface 51a of the partition member 51 to position the partition member 51. Specifically, when viewed in the axial direction, the radially inner end faces 60a of the protrusions 60 abut against the outer peripheral surface 51a of the partition member 51 to position the partition member 51. The partition member 51 is fixed to the bottom portion 12a with brazing material 53 in a state where it is positioned by the three protrusions 60. The brazing material 53 is provided around the entire circumference of the partition member 51, and the entire circumference of the partition member 51 and the bottom portion 12a are fixed together with no gaps by the brazing material 53. The partition member 51 may also be fixed to the bottom portion 12a by welding.

[0065] The compressor 100 of the second embodiment can achieve the same effects as the compressor 100 of the first embodiment.

[0066] As will be described below, the compressors 100 according to the first and second embodiments are particularly suitable for use as the refrigerant in the present invention when a flammable refrigerant such as R290, which is subject to refrigerant amount restrictions, is used.

[0067] In recent years, awareness of environmental conservation has increased, and refrigerants used in refrigeration cycle devices equipped with compressors are required to have reduced ozone depletion potential (ODP) and global warming potential (GWP). Refrigerants with low GWP tend to be highly flammable, and because they are flammable, the amount of refrigerant that can be sealed in a refrigeration cycle device is limited.

[0068] Furthermore, in a compressor, lubrication ability decreases when the refrigerant dissolves in the refrigeration oil and the oil concentration decreases, so an amount of oil is required that can maintain lubrication ability even when the refrigerant dissolves. In other words, the amount of refrigeration oil to be charged is limited to a lower limit depending on the amount of refrigerant charged, and it is not desirable to reduce the amount below that lower limit. On the other hand, it is desirable to reduce the amount of refrigeration oil to as low as possible from the perspective of cost reduction, etc. Therefore, in a compressor that uses a flammable refrigerant with a limited amount of refrigerant to be charged, it is necessary to reduce the amount of oil while maintaining the oil concentration.

[0069] In the compressors 100 of the first and second embodiments, when the refrigerating machine oil 300 is charged up to a required oil level height, the bottom-raising structure 50 can reduce the amount of refrigerating machine oil 300 charged. For this reason, the compressors 100 of the first and second embodiments are particularly suitable for use with a flammable refrigerant such as R290, which is subject to refrigerant amount restrictions.

[0070] Embodiment 3 The third embodiment relates to a refrigeration cycle apparatus such as an air conditioner in which the compressor 100 according to the first and second embodiments is installed.

[0071] 10 is a refrigerant circuit diagram showing a schematic configuration of a refrigeration cycle apparatus 200 according to a third embodiment. The refrigeration cycle apparatus 200 includes a refrigerant circuit in which a compressor 100, a suction muffler 101, a four-way switching valve 102, an outdoor heat exchanger 103, a pressure reducer 104, and an indoor heat exchanger 105 are connected by piping. A refrigerant circulates in the refrigerant circuit together with refrigeration oil. The refrigerant may be R290, R32, or R410A.

[0072] The outdoor heat exchanger 103 and the indoor heat exchanger 105 function as a condenser or an evaporator depending on the switching of the four-way switching valve 102. The four-way switching valve 102 can be omitted in the refrigeration cycle apparatus 200. Therefore, the refrigeration cycle apparatus 200 may be configured to include a compressor 100, a condenser, a pressure reducer, and an evaporator. In the air conditioner, the indoor heat exchanger 105 is installed in the indoor device, and the remaining compressor 100, four-way switching valve 102, outdoor heat exchanger 103, and pressure reducer 104 are installed in the outdoor device.

[0073] The compressor 100 is the compressor 100 according to any one of the first and second embodiments. The four-way switching valve 102 is connected to the discharge side of the compressor 100 and switches the flow of refrigerant from the compressor 100. The outdoor heat exchanger 103 is, for example, a fin-tube type heat exchanger including a pipe through which the refrigerant flows and fins into which the pipe is inserted. The pressure reducer 104 expands the refrigerant. The pressure reducer 104 is, for example, an electronic expansion valve or a thermostatic expansion valve whose opening is adjustable, but may also be a capillary tube whose opening is not adjustable. The indoor heat exchanger 105 is, for example, a fin-tube type heat exchanger including a pipe through which the refrigerant flows and fins into which the pipe is inserted.

[0074] In heating operation when the refrigeration cycle apparatus 200 is applied to an air conditioner, the four-way switching valve 102 is connected to the solid line side in FIG. 10. The high-temperature, high-pressure refrigerant compressed by the compressor 100 flows to the indoor heat exchanger 105, where it condenses and liquefies. The liquefied refrigerant is decompressed by the pressure reducer 104, becomes a two-phase refrigerant with low temperature and low pressure, flows to the outdoor heat exchanger 103, evaporates, gasifies, and returns to the compressor 100 through the four-way switching valve 102. In other words, the refrigerant circulates as shown by the solid arrows in FIG. 10. Through this circulation, the refrigerant exchanges heat with the outside air in the outdoor heat exchanger 103, which serves as an evaporator, and absorbs heat. The refrigerant that has absorbed heat is sent to the indoor heat exchanger 105, which serves as a condenser, where it exchanges heat with the indoor air and warms the indoor air.

[0075] In cooling operation, the four-way switching valve 102 is connected to the dashed line side in Figure 10. When switching from heating operation to cooling operation, the indoor heat exchanger 105 changes from a condenser to an evaporator, and the outdoor heat exchanger 103 changes from an evaporator to a condenser. The high-temperature, high-pressure refrigerant compressed by the compressor 100 flows to the outdoor heat exchanger 103, where it condenses and liquefies. The liquefied refrigerant is reduced in pressure by the pressure reducer 104 and becomes a low-temperature, low-pressure two-phase refrigerant. The low-temperature, low-pressure two-phase refrigerant flows to the indoor heat exchanger 105, evaporates, and gasifies, passing through the four-way switching valve 102 and returning to the compressor 100. In other words, the refrigerant circulates as shown by the dashed arrows in Figure 10. Through this circulation, the refrigerant exchanges heat with the indoor air in the indoor heat exchanger 105, which serves as an evaporator, absorbing heat and cooling the indoor air. The refrigerant that has absorbed heat is sent to the outdoor heat exchanger 103, which is a condenser, and exchanges heat with the outside air, releasing the heat to the outside air.

[0076] The refrigeration cycle device 200 having the above configuration includes the compressor 100 according to the first and second embodiments, and therefore the amount of refrigeration oil sealed in the sealed container 10 can be reduced.

[0077] The refrigeration cycle device 200 can be applied to refrigerators, freezers, vending machines, refrigeration devices, water heaters, and the like in addition to air conditioners. [Explanation of symbols]

[0078] 10 sealed container, 10a oil reservoir, 11 upper container, 11a top plate, 11b cylindrical portion, 12 lower container, 12a bottom, 12a1 bottom center, 12a2 truncated cone portion, 12a3 bottom cylindrical portion, 12aa inner peripheral surface, 12b cylindrical portion, 13 fixed leg, 20 compression mechanism, 21 rotating shaft, 21a main shaft portion, 21b eccentric shaft portion, 21c counter shaft portion, 22 rolling piston, 23 cylinder, 23a cylinder chamber, 23b back pressure chamber, 23c vane groove, 23d suction port, 24 upper bearing, 25 lower bearing, 26 vane, 26a rear end portion, 26b tip portion, 27 discharge muffler, 28 oil filler port, 29 vane spring, 30 electric motor, 31 rotor, 32 Stator, 50 bottom-raised structure, 51 partition member, 51a outer peripheral surface, 52 positioning portion, 52a stepped portion, 52aa mounting surface, 52ab cylindrical surface, 53 brazing material, 60 convex portion, 60a end surface, 61 discharge pipe, 100 compressor, 101 suction muffler, 101a suction connecting pipe, 102 four-way switching valve, 103 outdoor heat exchanger, 104 pressure reducer, 105 indoor heat exchanger, 200 refrigeration cycle device, 300 refrigeration oil.

Claims

1. a compression mechanism that compresses a refrigerant; an electric motor that drives the compression mechanism; a rotating shaft that connects the compression mechanism and the electric motor and transmits a rotational force of the electric motor to the compression mechanism; a sealed container that houses the compression mechanism, the electric motor, and the rotating shaft and has an oil reservoir in a lower portion in which refrigerating machine oil is stored; a bottom-raising structure that raises the bottom of the oil reservoir, the sealed container is located below the rotation shaft and has a cylindrical bottom portion with a bottom that forms a bottom surface of the oil reservoir, The bottom-up structure is a plate-shaped partition member that divides the inside of the bottom portion into two spaces in the axial direction of the rotary shaft to raise the bottom of the oil reservoir; a positioning portion that protrudes from an inner peripheral surface of the bottom portion and positions the partition member, the partition member is fixed to the bottom portion while being positioned by the positioning portion, The compressor, wherein a space surrounded by the partition member and the bottom is airtightly separated from a space in the sealed container in which the compression mechanism and the electric motor are disposed.

2. 2. The compressor according to claim 1, wherein the positioning portion is formed in a stepped shape when viewed in a cross section including the axis of the sealed container, and is a step portion formed in an annular shape on the inner circumferential surface of the bottom portion with the axis as the center.

3. the step portion has an annular mounting surface extending in a radial direction and a circumferential direction of the rotating shaft, and a cylindrical surface extending in the axial direction from the entire outer periphery of the mounting surface, The compressor according to claim 2, wherein the partition member is positioned on the step portion by abutting on the mounting surface or the cylindrical surface of the step portion.

4. The compressor according to claim 1 , wherein the positioning portion is a plurality of protrusions provided at intervals in the circumferential direction on the inner peripheral surface of the bottom portion.

5. 5. The compressor according to claim 4, wherein the partition member is positioned by contacting end surfaces of the plurality of protrusions that are radially inward of the rotary shaft.

6. 6. The compressor according to claim 4, wherein the number of the plurality of protrusions is three or more.

7. A refrigeration cycle device comprising the compressor according to any one of claims 1 to 5, a condenser, a pressure reducer, and an evaporator.

8. a compression mechanism that compresses a refrigerant; an electric motor that drives the compression mechanism; a rotating shaft that connects the compression mechanism and the electric motor and transmits a rotational force of the electric motor to the compression mechanism; a sealed container that houses the compression mechanism, the electric motor, and the rotating shaft, and has an oil reservoir in a lower portion in which refrigerating machine oil is stored, the sealed container is located below the rotation shaft and has a cylindrical bottom portion with a bottom that forms a bottom surface of the oil reservoir, A method for manufacturing a compressor in which a plate-shaped partition member that divides the inside of the bottom into two spaces in the axial direction of the rotating shaft is positioned on a positioning portion that protrudes from the inner surface of the bottom, and the partition member is fixed to the bottom, so that the space enclosed by the partition member and the bottom is airtightly separated from the space in the sealed container in which the compression mechanism and the electric motor are arranged.

9. a brazing material is disposed on the partition member in a state where the partition member is positioned in the positioning portion so as to be in contact with the entire periphery of the partition member; The method for manufacturing a compressor according to claim 8, wherein the bottom portion having the brazing material disposed therein is placed in a furnace to melt the brazing material, thereby fixing the partition member to the bottom portion.

10. 9. The method for manufacturing a compressor according to claim 8, wherein the partition member is fixed to the bottom by welding.

11. the positioning portion is formed in a stepped shape when viewed in a cross section including an axis of the sealed container, and is a stepped portion formed in an annular shape on an inner circumferential surface of the bottom portion with the axis as a center, The method for manufacturing a compressor according to any one of claims 8 to 10, wherein the step portion is formed by press working.

12. the positioning portions are a plurality of protrusions provided at intervals in the circumferential direction on the inner circumferential surface of the bottom portion, The method for manufacturing a compressor according to any one of claims 8 to 10, wherein the plurality of protrusions are formed by press working.

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